Add a syscall() implementation using a hacked version of the syscall6 macro.

Untested, but syscall() is needed by busybox for pivot_root at least.

libc/sysdeps/linux/sh/Makefile

@@ -31,7 +31,7 @@ CTOR_TARGETS=$(TOPDIR)lib/crti.o $(TOPDIR)lib/crtn.o
 SSRC=setjmp.S __longjmp.S vfork.S clone.S
 SOBJS=$(patsubst %.S,%.o, $(SSRC))
 
-CSRC=_mmap.c longjmp.c pipe.c __init_brk.c brk.c sbrk.c
+CSRC=_mmap.c longjmp.c pipe.c __init_brk.c brk.c sbrk.c syscall.c
 COBJS=$(patsubst %.c,%.o, $(CSRC))
 
 OBJS=$(SOBJS) $(MOBJ) $(COBJS)

libc/sysdeps/linux/sh/syscall.c

@@ -0,0 +1,25 @@
+
+
+#include <features.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+
+long syscall(long sysnum,
+			 long arg1, long arg2, long arg3,
+			 long arg4, long arg5, long arg6)
+{
+register long __sc3 __asm__ ("r3") = sysnum;
+register long __sc4 __asm__ ("r4") = (long) arg1;
+register long __sc5 __asm__ ("r5") = (long) arg2;
+register long __sc6 __asm__ ("r6") = (long) arg3;
+register long __sc7 __asm__ ("r7") = (long) arg4;
+register long __sc0 __asm__ ("r0") = (long) arg5;
+register long __sc1 __asm__ ("r1") = (long) arg6;
+__asm__ __volatile__ ("trapa	#0x15" \
+	: "=z" (__sc0) \
+	: "0" (__sc0), "r" (__sc4), "r" (__sc5), "r" (__sc6), "r" (__sc7), \
+	  "r" (__sc3), "r" (__sc1) \
+	: "memory" );
+__syscall_return(long,__sc0);
+}